Abstract
A method for the separation of zirconium isotopes based on a two-colour photoionisation scheme is reported. Laser vaporisation of a zirconium rod together with cooling by supersonic expansion in a molecular beam apparatus provides a high concentration of atomic zirconium. Hyperfine splitting in the z 3F 2 ← a 3F 2 transition of atomic zirconium allows isotopically selective absorption of a first photon. Subsequent absorption of two photons, the first resonantly, gives selectivities of = 100 for ionisation of 91Zr.
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